What percentage of natural conceptions fail?

According to your textbook, which of the following is true regarding adolescents and Internet use?

A) While earlier studies indicated that Internet use was associated with becoming less socially connected, recent studies indicate it might be associated with feeling more socially connected. B) While earlier studies indicated that Internet use was associated with becoming more socially connected, recent studies indicate it might be associated with feeling less socially connected. C) Studies indicate that social connectedness is associated with cyberbullying. D) The majority of adolescents meet the criteria for pathological Internet use.

By pairing the ringing of a bell with the presentation of meat, Pavlov trained dogs to salivate to the sound of a bell even when no meat was presented. In this experiment, the presentation of the meat was the _______

a. unconditioned stimulus b. unconditioned response c. conditioned stimulus d. conditioned response